Device for reducing piston slap in internal-combustion engines



Jan, 8, 1929.

D. M. SOLENBERGER DEVICE FOR REDUCING PISTON SLAP IN INTERNAL COMBUSTIONENGINES Original Filed March 1926 avwzulo'a 647? N 5026771 676)"Patented Jan. 8, 1929.

UNITED DEAN M. SOLENBERGER, OF CLEVELAND, OHIO, ASSIGNOR TO THE SIMPLEXPISTON RING COMPANY OF AMERICA, INC., A CORPORATION OF OHIO.

DEVICE FOR REDUCING PISTON SLAP IN INTERNAL-COMBUSTION ENGINES.

Original application filed March 1, 1926, Serial No. 91,601, new PatentNo. 1,662,544, dated March 13, 1928. Divided and this application filedSeptember 26, 1927. Serial No. 222,094.

The. invention relates to devices for preventing piston slap in internalcombustion engines and forms subject matter of my former application adivisional of .part of the Ser.

No. 91,601, filed March 1, 1926. In this earlier application a. numberofdifferent specific constructions were shown all including aradial- 1yexpansible piston ring in a groove in the piston together with means forexerting a preponderance of'radial pressure between the ring and oneside of the piston whereby said piston is held in closer contact withthe opposite side of the cylinder.

The present invention is a construction of this general character inwhich the piston is provided with an eccentric groove being of greaterdepth on one side than the other and the invention consists in the novelconstrue tion and combination of parts as hereinafter se tforth.

In the drawings; I Figure 1 is a horizontal section through an enginecylinder and piston constructed in accordance with my invention.

I Figure 2 is a vertical section therethrough. In the present state ofthe art piston rings are frequently provided with expanders locatedbetween the inner face of the ring and the bottom of the ring groove toincrease the radial pressure and to distribute the same about the axisof the cylinder. Such a. construction will not always prevent pistonslap as the radial pressures on opposite sides are in exact balance andtherefore may not: under some conditions overcome the alternatelyoposite angular thrust of the connecting rod. f, however, the clearancebetween the inner face of the ring and the bottom of the ring groove isgreater on one side of the piston than the diametrically opposite sidethis will cause a preponderance of resilient pressure in the shallowwill tend to hol cylinder.

ort-ion of the groove which the piston to one wall of the To produce theconstruction just described all that is necessary is to deepen thegroove on one side of the piston which may be practically accomplishedby the use of a suitable grooving tool. The same or similar piston ringsand reinforcingexpanders are then inserted in the groove with the resultthat a differential radial pressure is applied to di ametricallyopposite sides of the ring. This, as previously stated, will cause thepiston to travel in closer contact with the cylinder wall on the lowpressure side and will thereby lessen piston sla In detail A is thepiston having the eccentric groove B therein having the greatest depthat the point C and the least depth at the diametrically opposite pointC. B is a transsplit piston ring located in said groove and E is acorrugated ribbon expanderinscrted between the inner face of the ringand the bottom of the groove. By properly selecting the expander E anydesired differential pressure may be placed upon the piston;

What I claim as my invention is:

1. The combination with a cylinder. of a piston loosely fitting the sameprovided with a ring groove of greater depth on one side of said pistonthan upon the diametrically opposite side, a. trans-split ring engagingsaid groove and a corrugated ribbon expander located between the innerface of the ring and the bottom of the groove,

2. The combination with a cylinder, of a piston loosely fitting the sameprovided with an eccentric ring groove having the greater depth on oneside of the piston than upon the diametrically oppositeside, atrans-split ring ofuniform radial depth engaging said groove and auniformly corrugated ribbon expander located bet-ween the inner face ofthe ring and the bottom of the ring groove.

In testimony whereof I aifix my signature.

DEAN M. SOLENBERGE-R.

